[Einar72]

Hey Terry, is there a lengthening or shortening of the image where the bars are? If this is a sweep-waveform problem, it would explain why the tube is darker in places, since a faster trace would cause less electrons to hit the phosphor, and would thus appear darker. My Fairfield had some minor distortion on the left side, but it didn't produce those dark bars.

Did you replace that nasty .01 cap across the H-waveform coil terminals? I can't remember if it was you or someone else who brought the subject up a while back. Anyway, my money is on the waveform adjustment slug in the H-osc can, don't remember for sure, but I think it's the bottom one...